piecemeal/piecemeal/worker/index.mjs

Effortless incrementally deliver your data

import { generate } from 'piecemeal';

const Encoder = new TextEncoder();
const asUTF8 = (input) => Encoder.encode(input);
const stream = (data, requestInit = {}, options = {}) => {
    const { readable, writable } = new TransformStream();
    const boundary = options.boundary || '-';
    requestInit.headers = {
        ...requestInit.headers,
        connection: 'keep-alive',
        'content-type': `multipart/mixed;boundary="${boundary}"`,
        'transfer-encoding': 'chunked',
    };
    const pipe = async () => {
        const writer = writable.getWriter();
        await generate(data, boundary, (data) => writer.write(asUTF8(data)));
        return writer.releaseLock();
    };
    return {
        response: new Response(readable, requestInit),
        pipe,
    };
};

export { stream };